S.P.L.U.R.T-Station-13/code/game/atoms_movable.dm

/atom/movable
	layer = OBJ_LAYER
	var/last_move = null
	var/anchored = FALSE
	var/datum/thrownthing/throwing = null
	var/throw_speed = 2 //How many tiles to move per ds when being thrown. Float values are fully supported
	var/throw_range = 7
	var/mob/pulledby = null
	var/initial_language_holder = /datum/language_holder
	var/datum/language_holder/language_holder
	var/verb_say = "says"
	var/verb_ask = "asks"
	var/verb_exclaim = "exclaims"
	var/verb_whisper = "whispers"
	var/verb_yell = "yells"
	var/inertia_dir = 0
	var/atom/inertia_last_loc
	var/inertia_moving = 0
	var/inertia_next_move = 0
	var/inertia_move_delay = 5
	var/pass_flags = 0
	var/moving_diagonally = 0 //0: not doing a diagonal move. 1 and 2: doing the first/second step of the diagonal move
	var/list/client_mobs_in_contents // This contains all the client mobs within this container
	var/list/acted_explosions	//for explosion dodging
	glide_size = 8
	appearance_flags = TILE_BOUND|PIXEL_SCALE
	var/datum/forced_movement/force_moving = null	//handled soley by forced_movement.dm
	var/floating = FALSE
	var/movement_type = GROUND		//Incase you have multiple types, you automatically use the most useful one. IE: Skating on ice, flippers on water, flying over chasm/space, etc.
	var/atom/movable/pulling
	var/grab_state = 0

/atom/movable/vv_edit_var(var_name, var_value)
	var/static/list/banned_edits = list("step_x", "step_y", "step_size")
	var/static/list/careful_edits = list("bound_x", "bound_y", "bound_width", "bound_height")
	if(var_name in banned_edits)
		return FALSE	//PLEASE no.
	if((var_name in careful_edits) && (var_value % world.icon_size) != 0)
		return FALSE
	switch(var_name)
		if("x")
			var/turf/T = locate(var_value, y, z)
			if(T)
				forceMove(T)
				return TRUE
			return FALSE
		if("y")
			var/turf/T = locate(x, var_value, z)
			if(T)
				forceMove(T)
				return TRUE
			return FALSE
		if("z")
			var/turf/T = locate(x, y, var_value)
			if(T)
				forceMove(T)
				return TRUE
			return FALSE
		if("loc")
			if(var_value == null || istype(var_value, /atom))
				forceMove(var_value)
				return TRUE
			return FALSE
	return ..()

/atom/movable/proc/start_pulling(atom/movable/AM,gs)
	if(QDELETED(AM))
		return FALSE
	if(!(AM.can_be_pulled(src)))
		return FALSE

	// If we're pulling something then drop what we're currently pulling and pull this instead.
	if(pulling)
		if(gs==0)
			stop_pulling()
			return FALSE
		// Are we trying to pull something we are already pulling? Then enter grab cycle and end.
		if(AM == pulling)
			grab_state = gs
			if(istype(AM,/mob/living))
				var/mob/living/AMob = AM
				AMob.grabbedby(src)
			return TRUE
		stop_pulling()
	if(AM.pulledby)
		add_logs(AM, AM.pulledby, "pulled from", src)
		AM.pulledby.stop_pulling() //an object can't be pulled by two mobs at once.
	pulling = AM
	AM.pulledby = src
	grab_state = gs
	if(ismob(AM))
		var/mob/M = AM
		add_logs(src, M, "grabbed", addition="passive grab")
		visible_message("<span class='warning'>[src] has grabbed [M] passively!</span>")
	return TRUE

/atom/movable/proc/stop_pulling()
	if(pulling)
		pulling.pulledby = null
		var/mob/living/ex_pulled = pulling
		pulling = null
		grab_state = 0
		if(isliving(ex_pulled))
			var/mob/living/L = ex_pulled
			L.update_canmove()// mob gets up if it was lyng down in a chokehold

/atom/movable/proc/Move_Pulled(atom/A)
	if(!pulling)
		return
	if(pulling.anchored || !pulling.Adjacent(src))
		stop_pulling()
		return
	if(isliving(pulling))
		var/mob/living/L = pulling
		if(L.buckled && L.buckled.buckle_prevents_pull) //if they're buckled to something that disallows pulling, prevent it
			stop_pulling()
			return
	if(A == loc && pulling.density)
		return
	if(!Process_Spacemove(get_dir(pulling.loc, A)))
		return
	step(pulling, get_dir(pulling.loc, A))

/atom/movable/proc/check_pulling()
	if(pulling)
		var/atom/movable/pullee = pulling
		if(pullee && get_dist(src, pullee) > 1)
			stop_pulling()
			return
		if(!isturf(loc))
			stop_pulling()
			return
		if(pullee && !isturf(pullee.loc) && pullee.loc != loc) //to be removed once all code that changes an object's loc uses forceMove().
			log_game("DEBUG:[src]'s pull on [pullee] wasn't broken despite [pullee] being in [pullee.loc]. Pull stopped manually.")
			stop_pulling()
			return
		if(pulling.anchored)
			stop_pulling()
			return




/atom/movable/Move(atom/newloc, direct = 0)
	var/atom/movable/pullee = pulling
	var/turf/T = loc
	if(pulling)
		if(pullee && get_dist(src, pullee) > 1)
			stop_pulling()

		if(pullee && pullee.loc != loc && !isturf(pullee.loc) ) //to be removed once all code that changes an object's loc uses forceMove().
			log_game("DEBUG:[src]'s pull on [pullee] wasn't broken despite [pullee] being in [pullee.loc]. Pull stopped manually.")
			stop_pulling()
	if(!loc || !newloc)
		return FALSE
	var/atom/oldloc = loc

	if(loc != newloc)
		if (!(direct & (direct - 1))) //Cardinal move
			. = ..()
		else //Diagonal move, split it into cardinal moves
			moving_diagonally = FIRST_DIAG_STEP
			var/first_step_dir
			if (direct & NORTH)
				if (direct & EAST)
					if (step(src, NORTH))
						first_step_dir = NORTH
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, EAST)
					else if (step(src, EAST))
						first_step_dir = EAST
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, NORTH)
				else if (direct & WEST)
					if (step(src, NORTH))
						first_step_dir = NORTH
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, WEST)
					else if (step(src, WEST))
						first_step_dir = WEST
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, NORTH)
			else if (direct & SOUTH)
				if (direct & EAST)
					if (step(src, SOUTH))
						first_step_dir = SOUTH
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, EAST)
					else if (step(src, EAST))
						first_step_dir = EAST
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, SOUTH)
				else if (direct & WEST)
					if (step(src, SOUTH))
						first_step_dir = SOUTH
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, WEST)
					else if (step(src, WEST))
						first_step_dir = WEST
						moving_diagonally = SECOND_DIAG_STEP
						. = step(src, SOUTH)
			if(moving_diagonally == SECOND_DIAG_STEP)
				if(!.)
					setDir(first_step_dir)
				else if (!inertia_moving)
					inertia_next_move = world.time + inertia_move_delay
					newtonian_move(direct)
			moving_diagonally = 0
			return

	if(!loc || (loc == oldloc && oldloc != newloc))
		last_move = 0
		return

	if(.)
		Moved(oldloc, direct)
	if(. && pulling && pulling == pullee) //we were pulling a thing and didn't lose it during our move.
		if(pulling.anchored)
			stop_pulling()
			return
		var/pull_dir = get_dir(src, pulling)
		if(get_dist(src, pulling) > 1 || ((pull_dir - 1) & pull_dir)) //puller and pullee more than one tile away or in diagonal position
			pulling.Move(T, get_dir(pulling, T)) //the pullee tries to reach our previous position
			if(pulling && get_dist(src, pulling) > 1) //the pullee couldn't keep up
				stop_pulling()
		if(pulledby && moving_diagonally != FIRST_DIAG_STEP && get_dist(src, pulledby) > 1)//separated from our puller and not in the middle of a diagonal move.
			pulledby.stop_pulling()


	last_move = direct
	setDir(direct)
	if(. && has_buckled_mobs() && !handle_buckled_mob_movement(loc,direct)) //movement failed due to buckled mob(s)
		return FALSE

//Called after a successful Move(). By this point, we've already moved
/atom/movable/proc/Moved(atom/OldLoc, Dir, Forced = FALSE)
	SendSignal(COMSIG_MOVABLE_MOVED, OldLoc, Dir, Forced)
	if (!inertia_moving)
		inertia_next_move = world.time + inertia_move_delay
		newtonian_move(Dir)
	if (length(client_mobs_in_contents))
		update_parallax_contents()

	if (orbiters)
		for (var/thing in orbiters)
			var/datum/orbit/O = thing
			O.Check()
	if (orbiting)
		orbiting.Check()

	var/datum/proximity_monitor/proximity_monitor = src.proximity_monitor
	if(proximity_monitor)
		proximity_monitor.HandleMove()

	return 1

/atom/movable/Destroy(force)

	QDEL_NULL(proximity_monitor)
	QDEL_NULL(language_holder)

	unbuckle_all_mobs(force=1)

	. = ..()
	if(loc)
		loc.handle_atom_del(src)
	for(var/atom/movable/AM in contents)
		qdel(AM)
	moveToNullspace()
	invisibility = INVISIBILITY_ABSTRACT
	if(pulledby)
		pulledby.stop_pulling()


// Previously known as HasEntered()
// This is automatically called when something enters your square
//oldloc = old location on atom, inserted when forceMove is called and ONLY when forceMove is called!
/atom/movable/Crossed(atom/movable/AM, oldloc)
	SendSignal(COMSIG_MOVABLE_CROSSED, AM)

/atom/movable/Uncrossed(atom/movable/AM)
	SendSignal(COMSIG_MOVABLE_UNCROSSED, AM)

//This is tg's equivalent to the byond bump, it used to be called bump with a second arg
//to differentiate it, naturally everyone forgot about this immediately and so some things
//would bump twice, so now it's called Collide
/atom/movable/proc/Collide(atom/A)
	SendSignal(COMSIG_MOVABLE_COLLIDE, A)
	if(A)
		if(throwing)
			throwing.hit_atom(A)
			. = TRUE
			if(!A || QDELETED(A))
				return
		A.CollidedWith(src)

/atom/movable/proc/forceMove(atom/destination)
	. = FALSE
	if(destination)
		. = doMove(destination)
	else
		CRASH("No valid destination passed into forceMove")

/atom/movable/proc/moveToNullspace()
	return doMove(null)

/atom/movable/proc/doMove(atom/destination)
	. = FALSE
	if(destination)
		if(pulledby)
			pulledby.stop_pulling()
		var/atom/oldloc = loc
		var/same_loc = oldloc == destination
		var/area/old_area = get_area(oldloc)
		var/area/destarea = get_area(destination)

		if(oldloc && !same_loc)
			oldloc.Exited(src, destination)
			if(old_area)
				old_area.Exited(src, destination)

		loc = destination

		if(!same_loc)
			var/turf/oldturf = get_turf(oldloc)
			var/turf/destturf = get_turf(destination)
			var/old_z = (oldturf ? oldturf.z : null)
			var/dest_z = (destturf ? destturf.z : null)
			if (old_z != dest_z)
				onTransitZ(old_z, dest_z)
			destination.Entered(src, oldloc)
			if(destarea && old_area != destarea)
				destarea.Entered(src, oldloc)

			for(var/atom/movable/AM in destination)
				if(AM == src)
					continue
				AM.Crossed(src, oldloc)
		Moved(oldloc, NONE, TRUE)
		. = TRUE

	//If no destination, move the atom into nullspace (don't do this unless you know what you're doing)
	else
		. = TRUE
		if (loc)
			var/atom/oldloc = loc
			var/area/old_area = get_area(oldloc)
			oldloc.Exited(src, null)
			if(old_area)
				old_area.Exited(src, null)
		loc = null

/atom/movable/proc/onTransitZ(old_z,new_z)
	SendSignal(COMSIG_MOVABLE_Z_CHANGED, old_z, new_z)
	for (var/item in src) // Notify contents of Z-transition. This can be overridden IF we know the items contents do not care.
		var/atom/movable/AM = item
		AM.onTransitZ(old_z,new_z)

//Called whenever an object moves and by mobs when they attempt to move themselves through space
//And when an object or action applies a force on src, see newtonian_move() below
//Return 0 to have src start/keep drifting in a no-grav area and 1 to stop/not start drifting
//Mobs should return 1 if they should be able to move of their own volition, see client/Move() in mob_movement.dm
//movement_dir == 0 when stopping or any dir when trying to move
/atom/movable/proc/Process_Spacemove(movement_dir = 0)
	if(has_gravity(src))
		return 1

	if(pulledby)
		return 1

	if(throwing)
		return 1

	if(!isturf(loc))
		return 1

	if(locate(/obj/structure/lattice) in range(1, get_turf(src))) //Not realistic but makes pushing things in space easier
		return 1

	return 0


/atom/movable/proc/newtonian_move(direction) //Only moves the object if it's under no gravity
	if(!loc || Process_Spacemove(0))
		inertia_dir = 0
		return 0

	inertia_dir = direction
	if(!direction)
		return 1
	inertia_last_loc = loc
	SSspacedrift.processing[src] = src
	return 1

/atom/movable/proc/throw_impact(atom/hit_atom, datum/thrownthing/throwingdatum)
	set waitfor = 0
	SendSignal(COMSIG_MOVABLE_IMPACT, hit_atom, throwingdatum)
	return hit_atom.hitby(src)

/atom/movable/hitby(atom/movable/AM, skipcatch, hitpush = TRUE, blocked)
	if(!anchored && hitpush)
		step(src, AM.dir)
	..()

/atom/movable/proc/safe_throw_at(atom/target, range, speed, mob/thrower, spin=TRUE, diagonals_first = FALSE, var/datum/callback/callback)
	return throw_at(target, range, speed, thrower, spin, diagonals_first, callback)

/atom/movable/proc/throw_at(atom/target, range, speed, mob/thrower, spin=TRUE, diagonals_first = FALSE, var/datum/callback/callback) //If this returns FALSE then callback will not be called.
	. = FALSE
	if (!target || (flags_1 & NODROP_1) || speed <= 0)
		return

	if (pulledby)
		pulledby.stop_pulling()

	//They are moving! Wouldn't it be cool if we calculated their momentum and added it to the throw?
	if (thrower && thrower.last_move && thrower.client && thrower.client.move_delay >= world.time + world.tick_lag*2)
		var/user_momentum = thrower.movement_delay()
		if (!user_momentum) //no movement_delay, this means they move once per byond tick, lets calculate from that instead.
			user_momentum = world.tick_lag

		user_momentum = 1 / user_momentum // convert from ds to the tiles per ds that throw_at uses.

		if (get_dir(thrower, target) & last_move)
			user_momentum = user_momentum //basically a noop, but needed
		else if (get_dir(target, thrower) & last_move)
			user_momentum = -user_momentum //we are moving away from the target, lets slowdown the throw accordingly
		else
			user_momentum = 0


		if (user_momentum)
			//first lets add that momentum to range.
			range *= (user_momentum / speed) + 1
			//then lets add it to speed
			speed += user_momentum
			if (speed <= 0)
				return//no throw speed, the user was moving too fast.

	. = TRUE // No failure conditions past this point.

	var/datum/thrownthing/TT = new()
	TT.thrownthing = src
	TT.target = target
	TT.target_turf = get_turf(target)
	TT.init_dir = get_dir(src, target)
	TT.maxrange = range
	TT.speed = speed
	TT.thrower = thrower
	TT.diagonals_first = diagonals_first
	TT.callback = callback

	var/dist_x = abs(target.x - src.x)
	var/dist_y = abs(target.y - src.y)
	var/dx = (target.x > src.x) ? EAST : WEST
	var/dy = (target.y > src.y) ? NORTH : SOUTH

	if (dist_x == dist_y)
		TT.pure_diagonal = 1

	else if(dist_x <= dist_y)
		var/olddist_x = dist_x
		var/olddx = dx
		dist_x = dist_y
		dist_y = olddist_x
		dx = dy
		dy = olddx
	TT.dist_x = dist_x
	TT.dist_y = dist_y
	TT.dx = dx
	TT.dy = dy
	TT.diagonal_error = dist_x/2 - dist_y
	TT.start_time = world.time

	if(pulledby)
		pulledby.stop_pulling()

	throwing = TT
	if(spin)
		SpinAnimation(5, 1)

	SendSignal(COMSIG_MOVABLE_THROW, TT, spin)
	SSthrowing.processing[src] = TT
	if (SSthrowing.state == SS_PAUSED && length(SSthrowing.currentrun))
		SSthrowing.currentrun[src] = TT
	TT.tick()

/atom/movable/proc/handle_buckled_mob_movement(newloc,direct)
	for(var/m in buckled_mobs)
		var/mob/living/buckled_mob = m
		if(!buckled_mob.Move(newloc, direct))
			forceMove(buckled_mob.loc)
			last_move = buckled_mob.last_move
			inertia_dir = last_move
			buckled_mob.inertia_dir = last_move
			return 0
	return 1

/atom/movable/CanPass(atom/movable/mover, turf/target)
	if(mover in buckled_mobs)
		return 1
	return ..()

// called when this atom is removed from a storage item, which is passed on as S. The loc variable is already set to the new destination before this is called.
/atom/movable/proc/on_exit_storage(datum/component/storage/concrete/S)
	return

// called when this atom is added into a storage item, which is passed on as S. The loc variable is already set to the storage item.
/atom/movable/proc/on_enter_storage(datum/component/storage/concrete/S)
	return

/atom/movable/proc/get_spacemove_backup()
	var/atom/movable/dense_object_backup
	for(var/A in orange(1, get_turf(src)))
		if(isarea(A))
			continue
		else if(isturf(A))
			var/turf/turf = A
			if(!turf.density)
				continue
			return turf
		else
			var/atom/movable/AM = A
			if(!AM.CanPass(src) || AM.density)
				if(AM.anchored)
					return AM
				dense_object_backup = AM
				break
	. = dense_object_backup

//called when a mob resists while inside a container that is itself inside something.
/atom/movable/proc/relay_container_resist(mob/living/user, obj/O)
	return


/atom/movable/proc/do_attack_animation(atom/A, visual_effect_icon, obj/item/used_item, no_effect)
	if(!no_effect && (visual_effect_icon || used_item))
		do_item_attack_animation(A, visual_effect_icon, used_item)

	if(A == src)
		return //don't do an animation if attacking self
	var/pixel_x_diff = 0
	var/pixel_y_diff = 0

	var/direction = get_dir(src, A)
	if(direction & NORTH)
		pixel_y_diff = 8
	else if(direction & SOUTH)
		pixel_y_diff = -8

	if(direction & EAST)
		pixel_x_diff = 8
	else if(direction & WEST)
		pixel_x_diff = -8

	animate(src, pixel_x = pixel_x + pixel_x_diff, pixel_y = pixel_y + pixel_y_diff, time = 2)
	animate(src, pixel_x = pixel_x - pixel_x_diff, pixel_y = pixel_y - pixel_y_diff, time = 2)

/atom/movable/proc/do_item_attack_animation(atom/A, visual_effect_icon, obj/item/used_item)
	var/image/I
	if(visual_effect_icon)
		I = image('icons/effects/effects.dmi', A, visual_effect_icon, A.layer + 0.1)
	else if(used_item)
		I = image(used_item.icon, A, used_item.icon_state, A.layer + 0.1)

		// Scale the icon.
		I.transform *= 0.75
		// The icon should not rotate.
		I.appearance_flags = APPEARANCE_UI_IGNORE_ALPHA

		// Set the direction of the icon animation.
		var/direction = get_dir(src, A)
		if(direction & NORTH)
			I.pixel_y = -16
		else if(direction & SOUTH)
			I.pixel_y = 16

		if(direction & EAST)
			I.pixel_x = -16
		else if(direction & WEST)
			I.pixel_x = 16

		if(!direction) // Attacked self?!
			I.pixel_z = 16

	if(!I)
		return

	flick_overlay(I, GLOB.clients, 5) // 5 ticks/half a second

	// And animate the attack!
	animate(I, alpha = 175, pixel_x = 0, pixel_y = 0, pixel_z = 0, time = 3)

/atom/movable/vv_get_dropdown()
	. = ..()
	. -= "Jump to"
	.["Follow"] = "?_src_=holder;[HrefToken()];adminplayerobservefollow=[REF(src)]"
	.["Get"] = "?_src_=holder;[HrefToken()];admingetmovable=[REF(src)]"

/atom/movable/proc/ex_check(ex_id)
	if(!ex_id)
		return TRUE
	LAZYINITLIST(acted_explosions)
	if(ex_id in acted_explosions)
		return FALSE
	acted_explosions += ex_id
	return TRUE

//TODO: Better floating
/atom/movable/proc/float(on)
	if(throwing)
		return
	if(on && !floating)
		animate(src, pixel_y = pixel_y + 2, time = 10, loop = -1)
		sleep(10)
		animate(src, pixel_y = pixel_y - 2, time = 10, loop = -1)
		floating = TRUE
	else if (!on && floating)
		animate(src, pixel_y = initial(pixel_y), time = 10)
		floating = FALSE

/* Language procs */
/atom/movable/proc/get_language_holder(shadow=TRUE)
	if(language_holder)
		return language_holder
	else
		language_holder = new initial_language_holder(src)
		return language_holder

/atom/movable/proc/grant_language(datum/language/dt, body = FALSE)
	var/datum/language_holder/H = get_language_holder(!body)
	H.grant_language(dt, body)

/atom/movable/proc/grant_all_languages(omnitongue=FALSE)
	var/datum/language_holder/H = get_language_holder()
	H.grant_all_languages(omnitongue)

/atom/movable/proc/get_random_understood_language()
	var/datum/language_holder/H = get_language_holder()
	. = H.get_random_understood_language()

/atom/movable/proc/remove_language(datum/language/dt, body = FALSE)
	var/datum/language_holder/H = get_language_holder(!body)
	H.remove_language(dt, body)

/atom/movable/proc/remove_all_languages()
	var/datum/language_holder/H = get_language_holder()
	H.remove_all_languages()

/atom/movable/proc/has_language(datum/language/dt)
	var/datum/language_holder/H = get_language_holder()
	. = H.has_language(dt)

/atom/movable/proc/copy_known_languages_from(thing, replace=FALSE)
	var/datum/language_holder/H = get_language_holder()
	. = H.copy_known_languages_from(thing, replace)

// Whether an AM can speak in a language or not, independent of whether
// it KNOWS the language
/atom/movable/proc/could_speak_in_language(datum/language/dt)
	. = TRUE

/atom/movable/proc/can_speak_in_language(datum/language/dt)
	var/datum/language_holder/H = get_language_holder()

	if(!H.has_language(dt))
		return FALSE
	else if(H.omnitongue)
		return TRUE
	else if(could_speak_in_language(dt) && (!H.only_speaks_language || H.only_speaks_language == dt))
		return TRUE
	else
		return FALSE

/atom/movable/proc/get_default_language()
	// if no language is specified, and we want to say() something, which
	// language do we use?
	var/datum/language_holder/H = get_language_holder()

	if(H.selected_default_language)
		if(can_speak_in_language(H.selected_default_language))
			return H.selected_default_language
		else
			H.selected_default_language = null


	var/datum/language/chosen_langtype
	var/highest_priority

	for(var/lt in H.languages)
		var/datum/language/langtype = lt
		if(!can_speak_in_language(langtype))
			continue

		var/pri = initial(langtype.default_priority)
		if(!highest_priority || (pri > highest_priority))
			chosen_langtype = langtype
			highest_priority = pri

	H.selected_default_language = .
	. = chosen_langtype

/* End language procs */
/atom/movable/proc/ConveyorMove(movedir)
	set waitfor = FALSE
	if(!anchored && has_gravity())
		step(src, movedir)

//Returns an atom's power cell, if it has one. Overload for individual items.
/atom/movable/proc/get_cell()
	return

/atom/movable/proc/can_be_pulled(user)
	if(src == user || !isturf(loc))
		return FALSE
	if(anchored || throwing)
		return FALSE
	return TRUE